Datasheet Linear Technology LTC1709EG-8#PBF — Datenblatt

Hersteller	Linear Technology
Serie	LTC1709-8
Artikelnummer	LTC1709EG-8#PBF

2-Phasen-, 5-Bit-VID-, Strommodus-, hocheffiziente, synchrone Abwärtsschaltregler

Datenblätter

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PDF, 273 Kb, Datei hochgeladen: Sep 20, 2017

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Preise

Verpackung

Package	SSOP-36
Package Code	G
Package Index	05-08-1640 (G36)

Parameter

Demo Boards	DC292A,DC292B-B
Design Tools	LTspice Model
Export Control	no
Features	VID, PolyPhase
Frequency	300 kHz
Integrated Inductor	no
Ishutdown	20 µA
Isupply	0.47 mA
Max Phases	2
Monolithic	no
Number of Outputs	1
Operating Temperature Range	0 to 85 °C
Output Current	40 A
Polyphase	yes
Switch Current	40 A
Synchronous	yes
Topology	Buck
Vin Max	36 V
Vin Min	4 V
Vout Max	1.85 V
Vout Min	1.1 V

Öko-Plan

RoHS

Compliant

Andere Optionen

LTC1709-9

Konstruktionshinweise

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Active Voltage Positioning Reduces Output Capacitors &mdash Design Solutions 10
PDF, 130 Kb, Datei veröffentlicht: Nov 1, 1999
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Design Solutions 10
November 1999
Active Voltage Positioning Reduces Output Capacitors
by Robert Sheehan
INTRODUCTION
Power supply performance, especially transient response,
is key to meeting todayвЂ™s demands for low voltage, high
current microprocessor power. In an effort to minimize
the voltage deviation during a load step, a technique that
has recently been coined вЂњactive voltage positioningвЂќ is
generating substantial interest and gaining popularity in
the portable computer market. The benefits include lower
peak-to-peak output voltage deviation for a given load
step, without having to increase the output filter capacitance. Alternatively, the output filter capacitance can be
reduced while maintaining the same peak-to-peak transient response.
BASIC PRINCIPLE
The term вЂњactive voltage positioningвЂќ (AVP) refers to
setting the power supply output voltage at a point that is
dependent on the load current. At minimum load, the
output voltage is set to a slightly higher than nominal level.
At full load, the output voltage is set to a slightly lower than
nominal level. Effectively, the DC load regulation is
degraded, but the load transient voltage deviation will be …
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Low Cost, High Efficiency 42A DC/DC Converter &mdash DN225
PDF, 87 Kb, Datei veröffentlicht: Mar 1, 2001
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advertisement Low Cost, High Efficiency 42A DC/DC Converter вЂ“ Design Note 225
Wei Chen
Introduction
The LTC В®1709-8/LTC1709-9 are dual, current mode,
2-phase controllers that drive two synchronous buck
stages out of phase. This architecture reduces the number of input and output capacitors without increasing
the switching frequency. The relatively low switching
frequency and integrated high current MOSFET drivers help obtain high power conversion efп¬Ѓciency for
low voltage, high current applications. Because of the
output ripple current cancellation, lower inductance
values can be used, resulting in faster load transient
response. This, plus a 5-bit VID programmable attenuator, makes it particularly attractive for CPU power supply
C1
1000pF 2 C5 0.01ОјF 3
R6 15k 4 R4
51k 5 C7 120pF
C8 1.2nF R1 10О© C2 0.1ОјF
1 6
7 R7 15k 8
9
10 C12
470pF 11
12 …

Artikel

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LTC1709 Low Cost, High Efficiency 42A Converters with VID Control Reduce Input and Output Capacitors &mdash LT Journal
PDF, 190 Kb, Datei veröffentlicht: May 1, 2000
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DESIGN IDEAS LTC1709 Low Cost, High Efficiency 42A
Converters with VID Control Reduce
Input and Output Capacitors by Wei Chen
Introduction
used, resulting in a faster load transient response. This, plus the 5-bit
VID table, makes these devices particularly attractive for CPU power
supply applications. Two VID tables
are available to comply with the
VRM 8.4 (LTC1709-8) and VRM9.0
(LTC1709-9) specifications. The LTC1709-8/LTC1709-9 are dual,
current mode, PolyPhaseв„ў controllers that drive two synchronous buck
stages out of phase. This architecture
reduces the number of input and
output capacitors without increasing
the switching frequency. The relatively low switching frequency and
integrated high current MOSFET
drivers help provide high powerconversion efficiency for low voltage,
high current applications. Because of
the output ripple current cancellation, lower value inductors can be
C1
1000pF Design Example
Figure 1 shows the schematic diagram of a 42A power supply for the
AMD Athlon microprocessor. With …

Modellreihe

Serie: LTC1709-8 (2)

LTC1709EG-8#PBF LTC1709EG-8#TRPBF

Herstellerklassifikation

Power Management > Switching Regulator > Digitally Programmable Regulators

Andere Namen:

LTC1709EG-8PBF, LTC1709EG-8 PBF, LTC1709EG8#PBF, LTC1709EG 8#PBF